Thank you all, so far!
I gave a second trial with CNX-D (ver. 1.5.1), and this is the result. I lowered the esposure by -1.5EV and applied the unsharp mask (+30). I don't know why I couldn't recover the highlight when I first tried CNX-D (ver. 1.5.0). Probably I failed to find the correct parameter slide.
There is no doubt that CNX-D will do the job! I tried it out recently, and used it, exclusively, in the distant past, back to Nikon Capture 4. The problem for me is that I just don't like CNX, either/or, this old dog will not learn new tricks. So, last week, I bit the bullet and bought the upgrade LR6 to my long dormant LR5. (I had stopped at LR5 when I went to subscription.) LR6 supports all my current cameras. The integrated catalog approach of LR does not bother me. I do rather like it, and the round trip capability with PS, ACR, opening as smart object, NIK filters, Zerene Stacker and using my custom camera profiles (ColorChecker Passport) are among the tricks I do not wish to give up. It feels like I'm back at home! If I should get a camera that is not supported, I will just use ViewNX-i as viewer and a router into PS through MetaRaw, (DNG/ACR,) or less ideally, use NX-i to make conversions, and filter in LR or ACR. Yes, LR6 and my older versions of PS will eventually stop working, when operating systems evolve. Might I outlive them!
Best of luck, Akira, in saving your money and finding the work flow that works for you! Short of the subscription millstone!